DPI is used to describe the resolution number of dots per inch in a digital print and the printing resolution of a hard copy print dot gain; the increase in the size of the halftone dots during printing. This is caused by the spreading of ink on the surface of the media.
Up to a point, printers with higher DPI produce clearer and more detailed output. A printer does not necessarily have a single DPI measurement; it is dependent on print mode, which is usually influenced by driver settings.
Vector image is the complete opposite of DPI because when your using a vector image when you zoom in on what image you have just made you dont pixels where as when you zoom in on DPI you can see all the pixels which ruins your image. So vector image saves your image when it is blown up or shrunk down.
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